Williams broke into the industry in the mid-1980s at Marvel Comics penciling Power Pack, written by Louise Simonson. While at Marvel he worked on a variety of titles including Strikeforce: Morituri, The Punisher, Uncanny X-Men (with Lee, Chris Claremont, and Bob Wiacek). He eventually moved to DC Comics where he worked on a variety of Batman titles including the Hush miniseries with Lee, All-Star Batman and Robin with Lee and Frank Miller and Batman: Odyssey with Neal Adams.